Ground fault detector for high-voltage DC power supplies

Details Ground fault detector for high-voltage DC power supplies Ground fault detector for high-voltage DC power supplies

1986-04-14

1989-02-28

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

324509, H02H 316

Patent

active

048091235

ABSTRACT:
To detect a ground fault, the alternating current leakage current to common AC electrical ground is sensed across a resistor and applied to one input of an analog gate. The analog gate is opened by the positive going voltage from the high-voltage secondary of the power supply transformers between 7 degrees from the crossover point and 103 degrees to pass only that portion of the potential representing the alternating current leakage current which is in phase with the potential on the secondary windings of the power supply transformer and thus provide a signal representing the real component of the AC impedance to ground. A reference preset level of impedance and the signal from the analog gate are compared to provide a signal whenever the real component of the AC leakage current exceeds the preset value.

REFERENCES:
patent: 4159501 (1979-06-01), White
patent: 4347540 (1982-08-01), Gary et al.
patent: 4375660 (1983-03-01), Tate et al.
patent: 4410925 (1983-10-01), Tucker et al.

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